Java Basics (Geek)--07, Java Common techniques-java compounding environment variables and common techniques (mostly overview, you can watch video)

1 Overview of this lesson

2 Course Overview

3 Computer Language Overview

4Java Getting Started

5JDK Introduction (useful)

6 Setting environment Variables (useful)

7 writing the first Java program

Program Structure of 8Java

9Eclipse Development Tools Overview

10 Downloads Eclipse(useful)

11Eclipse Development Environment Introduction (useful)

12 Creating a Java Project

13 Assigning a value to the args parameter of the Main method (useful)

14 Add operation

Project Structure of 15Java

16 Export of projects

17 Import of items

18 Modifying the project name, package name, and class name

19Math class (useful)

Writing specifications for 20Java programs

21 Common errors

22 Common Tips (useful)

/**
*
* 19Math Class
* The Math class is a tool class for mathematical operations in the JDK
*/
public class MyMath {


public static void Main (string[] args) {
System.out.println (Math.floor (10/3));//Only integral parts are reserved
System.out.println (Math.Round (3.75));//rounding the 1th digit after the decimal point
System.out.println (Math.Abs (-10));//Ball Absolute
System.out.println (Math.pow (3, 4));//3 4-Square =81
System.out.println (MATH.SQRT (100)); The square root of//100
System.out.println (Math.Round (3.75 * 10)/10.0);//The first digit after the decimal point is reserved


}


}

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Java Basics (Geek)--07, Java Common techniques-java compounding environment variables and common techniques (mostly overview, you can watch video)